Artificial hand.



Patented Apr; 8,1919.

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ARTIFICIAL HAND.

Specification of Letters Patent.

Patented Apr. 8, 1919.

Application filed November 27, 1917. Serial No. 204,297.

To all whom it may concern:

Be it known that I, Lr'ioN MAUBLANG, a citizen of the French Republic, residing at 8 Quai de lHopital, Nantes, France, have invented new and useful Improvements in Artificial Hands, of which the following is a specification.

This invention relates to artificial hands, its object being to produce a hand, articulated by a lever, wherein the thumb and fingers can be simultaneously opened.

The invention is shown in the accompanying drawings, in which Figures 1 and 2 are vertical sections of a hand in the closed and open positions respectively; Fig. 3 shows the waistcoat mechanism which controls the hand.

The opening and closing effect is obtained by a member 1 pivoting in the width of the hand and holding the four fingers. All the fingers have stems which engage or are connected with member 1 and are held by a sin gle pin to said member.

One ofthe fingers has a long stem 2 which acts as a lever. A counter-lever 3 pivoted on a bracket 4 secured to the back of the hand serves to provide rotary movement. At the extremity of the counter-lever is fixed or rovided a lever or stem 5 which protru es on the outside of the hand and receives a cord 6 united by a ring to a cord from the operating waistcoat (Fig. 3).

The user who manipulates the cord from the waistcoat through the intervention of the limbs of the trapeze (Fig. 3), pulls on this cord. Stem 5 causes the counter lever to swing which in turn draws along with it the long stem 2 in, a swinging movement which determines the amount of opening of the fingers. A stem 7 secured to member 1 pushes in front of it and carries with it a dowel 8 forming part of the thumb member. The thumb then pivots around its axis 9 and opens. The parts are brought back to the original position shown in Fig. 1 by means of a spiral spring mounted on the axis 9 in order to cause the fingers to press tightly down. The fingers have caoutchouc extremities 10 to help the grip.

The backward and forward movement of the hand is produced by the swivel 11 fitted near the wrist portion of the hand while rotation thereof is obtained by a ring member represented in section at 12.

The hand may be made of any suitable material more particularly adapted for lightness, as for instance a composition consisting of gum or glue or gelatin rendered insoluble, tissues of cotton or silk and a pulverulent body as sawdust, kieselguhr, magnesia, pumice powder.

The trapeze bars may be attached to the person in any simple manner such as shown in Fig. 3 wherein a are straps passing over the shoulders and attached to a belt I) passing around the waist.

I claim:

1. An artificial hand articulated by a lever which immediately and simultaneously produces the opening of the thumb and fingers through the intervention of a cord attached at one end to a counter lever, and at the other extremity to an operating waistcoat having two stems giving fixed points of attachment.

2. An artificial hand as claimed in claim 1 composed of suitable material such as a composition having a glue basis, suitable tissue, and light pulverulent body such as sawdust, pumice powder, magnesia or kieselguhr.

In witness whereof I have hereunto set my hand in presence of two witnesses.

LEON MAUBLANG.

Witnesses:

CR. MORISSCAUFF, G. Gorous.

copies of this patent may be obtained for Me cents each, by addressing the Commissioner of Patents,

Washington, D. G. I 

